To delete the dictionaries go to Tools >> Addons >> Go to Languages and select the language that you can delete and click on the Remove button:

https://support.cdn.mozilla.net/media.../2014-01-05-21-14-11-78805a.png

To add other language go to this link and download the language pack that you can:

• UK Language Pack
• More Languages

Get this addon:

• Simple Locale Switcher

Install it, then use it to change the language:

https://support.cdn.mozilla.net/media.../2014-01-05-21-19-56-943359.png

Well, yes, only problem is that US English isn't there, it is somewhere in the Mozilla register and I don't know how to get there. That's why I posted.

look in about:config for "en-US" , replace with "en-GB"

Thanks. I just replaced 3 or 4 en-US entries with en-GB, I still get told to spell organise with a 'Z'. I just restarted and looked: 'en-US' has disappeared but I still get US English as my default language. Mystery.

Because you probably do the English Firefox Download.

Try this Unistall Firefox:

• Unistalling Firefox

Go to Download Firefox Page:

• Download Firefox

In the bottom of the page change the language to English British: https://support.cdn.mozilla.net/media.../2014-01-06-13-17-35-bf1912.png

You can check the order of the installed languages.

• Tools > Options > Content > Languages

If you uninstall the en-US version and install the en-GB Firefox version then you shouldn't have the en-US dictionary anymore because the en-GB version comes without a dictionary because of licensing reasons and you need to install the en-GB dictionary yourself.

If you didn't uninstall the en-US version then you may still have the dictionaries folder in the Firefox program folder with the en-US dictionary and you can manually remove the dictionaries in this folder.

• http://kb.mozillazine.org/Dictionaries
• http://kb.mozillazine.org/Spell_checking

Thanks for the tools tip, feeling a bit stupid now. How do I find the en-US dictionary?

Here:

• Dictionaries & Language Packs

Yes, thanks again, I deleted MOST of the en-US entries that I found, some were connected to programs that I use. I also had to restart my PC. Perfect!

Quote: How do I find the en-US dictionary?

Do you mean where this dictionary is installed on your computer?

Is this dictionary available as a choice in the Languages menu if you right-click in a text area?

Did you look for a dictionaries folder?

• (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
• (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

If you installed this dictionary as an extension via the Add-ons website then the dictionary is installed as an extension in the Firefox profile folder and you need to uninstall this extension.

• https://support.mozilla.org/kb/Uninstalling+add-ons